Error of authorisation

Question

Hello!
Please tell me how to handle the wrong authorization error.
I use the following code:

smtp.UseBestLogin(Login_mail, Password_mail);

Thanks

Comments

What is the exception message, type and stack trace?

Answer 1

Please double check if credentials you provided are correct.

Some SMTP servers don't require authentication at all, consult your server administrator, and remove login line (UseBestLogin) if that is the case.